n8n Workflow: Monitor New Domains & Certificates, Email Alerts

Stay ahead of new domains and certificate changes—automatically

This n8n workflow monitors newly registered domains and Certificate Transparency activity on DomainKits every 30 minutes, then emails you a concise report (with a CSV attachment) showing only what changed since the last run.

What this workflow does

• Runs on a 30-minute schedule to continuously track updates.
• Lets you set a watch keyword and optional comma-separated domain suffixes to exclude from certificate results.
• Queries DomainKits for newly registered domains matching your keyword, and separately searches DomainKits Certificate Transparency logs for recent hostname activity.
• Correlates both result sets and compares them to the previous run stored in workflow static data.
• Sends alerts only for changes: new registrations and/or domains with new or advanced certificate activity.
• Fetches extra DNS context by running a DomainKits bulk DNS lookup for up to 20 changed domains to retrieve nameservers and listing status.
• Builds a human-readable email report and a structured records list, then delivers it via SMTP with the records attached as a CSV file.

Use cases

• Security and brand protection teams tracking new domains related to a keyword.
• SaaS operators monitoring certificate issuance trends for domains that match naming patterns.
• Automation engineers building repeatable DomainKits-based monitoring with reliable “only changes” logic.

Technical details

• Uses DomainKits Premium+ REST API (required for API access).
• Core nodes: Set, Code, Merge, Split Out, Email Send, and Sticky Note.
• Stores prior run state in workflow static data to avoid duplicate alerts.
• Outputs an SMTP email with CSV attachments for the changed domains.

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